I put up my slightly modified version of the usbled.c kernel module on github. It includes support for one of the cheapest incarnation of USB-led devices, the Riso Kagaku Corp. Webmail Notifier. It can now be built out-of-tree easily (trying to forward to the kernel guys to merge it eventually) and includes udev rules and a script to automate the re-binding of device from usbhid to the usbled driver).
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